Scoop swinging mechanism



June 3, 1952 s. s. POKORNY scomD swINGING MECHANISM Filed Jan. 26,' 1948 Snnentor Patented June 3, 1952 SCOOP SWINGING MECHANISM Stephen S. Pokorny, Maquoketa, Iowa Application January 26, 1948, Serial No. 4,440

1 Claim.

This invention relates to material moving devices and more particularly it is an object of the invention to provide a scoop tilting device therefor.

In the operation of material moving devices the scoops of the latter are first disposed in a down position for scooping up material at a time when the latter is lying on the ground. The scoop is then elevated to an up position and the material moving mechanism is driven to a desired dumping point, the operator then manipulates a lever or other control apparatus for dumping the scoop. In repeating this operation the scoop is again lowered to the ground and such lever or control apparatus is again manipulated by the operator for locking the scoop in a shoveling position.

'Throughout these operations the driver is busy with one of his hands on the steering apparatus of the material moving mechanism and the other of his hands is usually fully occupied With the shifting of the gears in the tractor, or other propelling mechanism of the material mover, as well as being occupied with the control employed for raising and lowering the scoop and scoop-supporting booms. As a result it is desirable to have means for retaining the scoop in an up position and for automatically returning the scoop to a shoveling position when the booms are lowered to the position for scooping material.

An object of this invention is to position the scoop mounting elements of a tractor scoop attaching mechanism to provide automatic returning of the scoop to the scooping position.

Another object of the invention is to provide a device for the purpose described which is sturdy and durable in construction, reliable and eflicient in operation, and relatively simple and inexpensive to manufacture, assemble and utilize.

Other and still further objects and advantages of the invention will become apparent from the following detailed description of a preferred embodiment thereof.

In the drawings:

Figure 1 is a top plan view of the scoop tilting device of the invention shown as attached to the material lifting mechanism of a tractor, the tractor being shown in dotted line; and

Figure 2 is a side elevation of the. mechanism shown in Figure 1, a wheel of the tractor and a portion of a hydraulic cylinder employed being broken away, the rear axle and rear axle housing being shown in section, an up position of the 2 booms and scoop, prior to the release of the scoop for drunpin'g, being shown in dotted lines.

The loading mechanism of this invention is generally indicated at I0 and is preferably for attachment to a tractor generally indicated at I2 in dotted lines.

The tractor I2 is preferably of a type provided with a square rear axle housing I4 and further provided with an oil pump unit adapted to operate uid pressure operated attachments and having suitable valve means, not shown, for controlling the operation of such attachments.

The loading mechanism I0 includes a pair of lifting arms I6 arranged at opposite sides of the tractor I2. The rearward ends of the arms I6 are pivotally attached adjacent the rearward end of the tractor l2 and preferably by means of a pair of Abrackets having supporting plates I8. The supporting plates I8 are preferably in a vertically disposed position and are preferably provided each with a pair of horizontally extending ears 20 at the upper ends thereof, to which latter the flattened rearward ends 23 of the lifting arms I6 are pivotally attached by means of a pair of pins 22. The supporting plates I8 may be secured in any suitable manner to the rear axle housing of the tractor I2; however, when the tractor I2 is one of the type having a square rear axle housing I4 surrounding its rear axle 24, then the supporting plate I8 is positioned flush against the forward side of the rear axle housing I 4, and a backing plate 26 is placed against the rearward side of the rear axle housing. Each backing plate is secured to its corresponding supporting plate by means of a pair of bolts 28 which are disposed above the rear axle housing and the second pair of bolts 3E) which are disposed below the rear axle housing, the said bolts being positioned in apertures in the supporting plate I8 and the backing plate 26.

Means are provided for raising the lifting arms I6 and such means includes a pair of hydraulic jacks .32 having their vcylinders pivotally attached to the opposite sides of the rearward end of the tractor I2.

Preferably, each of the cylinders 32 is provided with a flattened tab 3I on the rearward end thereof which are attached by means of a pin 33 to a pair of horizontally extending ears 34 which are in turn attached to the lower end of the corresponding supporting plate I8, the supporting plate I8 being of such a length as to extend both above and below the rear axle 24 of the tractor I2.

The jack cylinders 32 are attachedto -a source of hydraulic pressure such as an oil pump unit, not shown, the interconnection between the jack cylinders 32 and the oil pump unit being made by a pair of flexible conduits 36.

The jacks 32 are each provided with pistons 38 and piston rods 40, the outward ends of the piston rods 40 being each pivotally attached to the lower side and adjacent the front end of the lifting arms I6, the attachment being preferably made by means -of iapair of triangular connection plates 4i 4which 'are suitably attached to the under side of the lifting arms IS, the piston rods 40 being pivotally secured to the connecting plates 42 by means of a pair of pinsfd. Preferably, the jacks 32 are of such length when in a collapsed position that the pistonrods vtill'thereof will extend well toward the forward-end of the lifting arms I6.

The distance between the pivotal mountings of the rearward end of the lifting arms l5 and ftheLrearwardends .of lthe hydraulic jacks 32 is preferably such `as to .form a triangle between :the llifting arms it and their correspondinghydrau'lic yjacks and ssupporting plates, the angle 'formed :between Vthe supporting .plates `Hl andV their corresponding hydraulic -jacks 312 is lpreferably :an :angle :approaching f90 degrees or greater -fat times 'when the rlifting arms i5 are in their ilowest position.

At times whenthe ,lifting arnisilt arein raised ipositi'ons, the angle fforrned between the supportzing :plates als zand the corresponding hydraulic jacks 32 'becomes more and more acute `until 'at 'times twhen'the lifting arms 'i are in their 'uppermost position, preferably 'the hydraulic j-a'cks .32 will be substantially parallel with the lifting farms 1&6.

'Aisc'oop'i 'having tines' is pivotally mounted l'by1means 'of atpair of bolts 52 vdisposed at either side .thereof to the 'outer ends of the lifting arms 1.6.

MeaIIsareprOVided for controlling the position oftheisc'oop with .respieot'to the lifting arms it :andsuch'means includes -two crossbars Slt rigidlyatta'ched to each ofthe lifting arms iclosely adjacent .the 'rearward wall of the scoop 58.

TEhe rearward 'wall E6 of the scoop is provided with .a de'tent '6l rattached thereto. An upper surface of the detentfG! is disposed slightly upavardl-y declined with respect to the rearward wall 6B of the scoop. The detent @l is secured -to the rearward side gand la brace E3 is secured 'to l"the forward side -o'f the wall 56, opposite the 'detent vlil The -brace l'62! extends downwardly and is secured to one Yof the tines Evlill and 'is secured to `the rearward Awall cl by means of a bolted "fl'anget.

A vlatchorhook Hl is provided for the purpose of engagingthe detent I(il at desired times. The latch-"hook 'M is 'secured to a swinging oar li which latter extends between and transversely of the booms i6. The bar l! is pivotally secured to a mounting plate 72, which'latter is disposed acrossand secured to the crossbars @d adjacent one-.oflthebooms EB,

The latch "i0 -is attached to the swinging bar Y'll yadjacent the middle Ythereof and the other end-of the bar 1| ispivotally attached to a draw :rod 13.

lThe draw rod .'13 extends above and lengthwise 'ofthe adjacent boom 16 and at its rearward iend is pivotally secured to a medial point along a A.hand .leverl'I-d; .the latter being pivotally secured to the upper side of the boom I6 by means of a tab 15.

As thus described the lever 'I4 may be pulled rearwardly by the operator to disengage the latch-hook 10 from the upper side of the detent 61.

In order to maintain the latch yHl in engagement with the detent 61 at desired times, a coiled compression spring 15 is provided and is disposed-between a backing member T1 attached to the rearwardmost of lthe crossbar 64, the forward end of the compression spring 16 urging "forwardly against a block 18, which latter is Yfirmly attached to the swinging bar 1 I, for urging the bar 'H and to the latch l0 forwardly.

The foregoing described parts of the material moving mechanism are old in the art and the mechanism of this invention for automatically tilting fthe scoop 53 will now be described.

Such mechanism includes an arm 90 disposed transversely .of one of the booms I5. The arm iii) is preferablydisposed on the tractor Yside -of the zboom.

The arm 98 is pivotally secured, at a pointfl between the ends of .the arm, to the Yboom l5, The upper end of the arm v9% is provided withan aperture -Sll into which is secured .a .hook lmounted Vat the rearward end of la tension spring.

The forward end of the spring 9d is Vhooked into -an eyelet S3 of a pull cable lil. The pull cable it@ extends longitudinally of the corre= sponding boom i6 and is preferablyat-all times disposed above the said .boom fit.

At its forward end the-pull cable it@ is secured to a connection bar lei. The manner of -connection employed is Ithat the 'cable it@ Vextends through one of two .spaced :apart apertures in thefoonnection bar H32 then doubles backthrough the bar -Ill through theotherfof the apertures, and forms a-halfhitch upon itself, as best-shown in Figure 2. ri'fhe forwardend of the connection bar m2 is `pivotally vsecured by -a pin lilil -to -a side wall of the scoop 58.

The pin 04 is disposedlat apoint on the same side of the adjacent -boorn it ythat the upper end of the -arm 99 is disposed. In other words, the pin 7ltis disposedon the same side, as the upper end of the arm S0, of a -linedrawn between the pivotal attachment 52 between the scoopiSSand the adjacent boom 6B and the pivotal connection point 22 between the rearward end 'of the boom l and the .upper ear 2G.

A detent .ID3 is .provided and is secured tothe boom i6 Abehind Athe .pivot point 32 .in the path of the arm .90 so .that the .arm-or tension bar 9i? will be arrested to .prevent excessive clockwise pivotal movement .thereof during dumping of the scoop.

The lower portion of the arm 9i), beneath the pivotal connection S2, is disposed engaging va detent ring Htl. The detent ring Ii is Vdisposed about and secured to the jack cylinder 3f.

As thus described, at times when the scoop is in the shoveling position shown in Figure 2 with its bottom parallel to the surface -of the ground lil', the lower end ofthe arms 150 will be held in fa forward position as shown iniFigure 2. The upper endzof the arm 9% will thus -be maintained vin a rearward position for pulling rearwardlyon the Aupper side of the scoop '5S at the pivotpin 104. This automatically maintains the scoop 58 in the position shown in Figure l2 with its bottom lparallel `to the "surface Vof `the ground 10.

As the operator causes the scoop 58 to be elevated toward the dotted line position shown in Figure 2, the lower end of the arm 90 will be caused to move to a rearward position, since while the jack cylinder 32 and the ring I I0 swing upwardly, they also move slightly rearwardly.

This rearward motion will in turn cause the forward motion of the upper end of the arm 90, permitting the cable |00 to slacken. When the cable |00 is slack, the operator may then pull rearwardly on the lever 14, causing the latch to release the scoop 58 for dumping. y

When it is desired to return the scoop 58 to a shoveling position, the operator need only lower the boom, and the arm 90 will cause a rearward pull upon the upper portion of the scoop 58 for causing the scoop 58 to automatically return to a shoveling position, as best shown in full lines in Figure 2.

It will be seen that this invention has provided means for automatically returning the scoop of a material moving mechanism into shoveling po` sition at desired times and for automatically releasing the scoop to permit manual dumping at other desired times and with out the necessity of independent action by the operator for the purpose of adjusting the scoop into shoveling position.

From the foregoing description, it is thought to be obvious that a scoop swinging mechanism constructed in accordance with my invention is particularly Well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spirit thereof and for this reason, I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice, except as claimed.

I claim:

A material moving scoop comprising a pair of vertically disposed brackets, means on the brackets for attaching the brackets to an axle of a tractor, a scoop having a bottom with tines thereon, a rear wall and sides, a pair of lifting arms pivotally attached at one of the ends thereof to the upper ends of the brackets and pivotally attached at the other of the ends thereof to the sides of the scoop. a pair of hydraulic jacks pivotally attached at one of the ends thereof to the lower ends of the brackets and at the other of the ends thereof to said arms, a ring positioned on one of said hydraulic jacks, a cross bar extended between said arms and spaced from the rear wall of the scoop, a mounting plate extended from said cross bar and spaced from one of said arms, a transversely disposed swinging bar pivotally attached at one end to said mounting plate and extended across to the arm on the opposite side of the scoop, a hand lever pivotally mounted on and carried by the said arm on the opposite side of the scoop,

a draw bar connecting the swinging bar to the hand lever, a latch carried by the swinging bar for retaining the scoop in a material carrying position, a tension bar pivotally mounted on said hand lever carrying arm and positioned to be engaged by the ring on the hydraulic jack which is positioned below said hand lever carrying arm. a spring attached to the upper end of said tension bar, a connection bar attached to the side of the scoop on which the hand lever carrying arm is positioned, the point where the connection bar is attached to the scoop being positioned above the pivotal mounting of the scoop, and a cable connecting the spring of the tension bar to the connection bar whereby upon upward travel of the scoop tension on the scoop retaining cable is relieved and upon lowering of the scoop to scooping position the tension bar is actuated by the ring on the hydraulic jack for drawing the scoop to a horizontal position.

STEPHEN S. POKORNY.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,001,803 Stephens May 2l, 1935 2,398,964 Rogers et al Apr. 23, 1946 2,437,808 Drettmann Mar. 16, 1948 2,455,474 Drott et al. Dec. 7, 1948 2,457,049 Lacey .Dec. 21, 1948 2,482,365 Pokorny Sept. 20, 1949 2,482,612 Drott et al Sept. 20, 1949 2,503,577 Borgelt Apr. 11,1950 2,535,727 Dingley Dec. 26, 1950 

